libao 1.2.0 - Denial of Service

EDB-ID: 42400
Author: qflb.wu
Published: 2017-07-31
CVE: CVE-2017-11548
Type: Dos
Platform: Linux
Aliases: N/A
Advisory/Source: N/A
Tags: Denial of Service (DoS)
Vulnerable App: N/A

 ================ 
Author : qflb.wu
===============


Introduction:
=============
Libao is a cross-platform audio library that allows programs to output audio using a simple API on a wide variety of platforms.


Affected version:
=====
1.2.0


Vulnerability Description:
==========================
the _tokenize_matrix function in audio_out.c in Xiph.Org libao 1.2.0 can cause a denial of service(memory corruption) via a crafted mp3 file.


I found this bug when I test mpg321 0.3.2 which used the libao library.


./mpg321 libao_1.2.0_memory_corruption.mp3


----debug info:----
Program received signal SIGSEGV, Segmentation fault.
_int_malloc (av=av@entry=0x7ffff6f7f760 <main_arena>, bytes=bytes@entry=3)
at malloc.c:3740
3740malloc.c: No such file or directory.
(gdb) bt
#0 _int_malloc (av=av@entry=0x7ffff6f7f760 <main_arena>, bytes=bytes@entry=3)
at malloc.c:3740
#1 0x00007ffff6c442cc in __libc_calloc (n=<optimized out>,
elem_size=<optimized out>) at malloc.c:3219
#2 0x00007ffff728e189 in _tokenize_matrix () from /usr/local/lib/libao.so.4
#3 0x00007ffff728e607 in _matrix_to_channelmask ()
from /usr/local/lib/libao.so.4
#4 0x00007ffff72906f2 in _open_device () from /usr/local/lib/libao.so.4
#5 0x000000000040a6aa in open_ao_playdevice (header=header@entry=0x624af8)
at ao.c:411
#6 0x0000000000407e50 in output (data=<optimized out>, header=0x624af8,
pcm=0x627f44) at mad.c:974
#7 0x00007ffff749a85c in run_sync (decoder=0x7fffffffbc40) at decoder.c:439
#8 0x00007ffff749ab38 in mad_decoder_run (
decoder=decoder@entry=0x7fffffffbc40,
mode=mode@entry=MAD_DECODER_MODE_SYNC) at decoder.c:557
#9 0x0000000000403d5d in main (argc=<optimized out>, argv=<optimized out>)
at mpg321.c:1092
(gdb)


POC:
libao_1.2.0_memory_corruption.mp3
CVE:
CVE-2017-11548


Proof of Concept:
https://github.com/offensive-security/exploit-database-bin-sploits/raw/master/sploits/42400.zip

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